Vinod Tewary
 | The topic of this article may not meet Wikitia's general notability guideline. |
Vinod Tewary | |
|---|---|
| Born | 1940 Hardoi, U.P., India |
| Alma mater | University of Lucknow (B.S. and M.S., Physics) Delhi University (Ph.D., Solid-state Physics) |
| Known for | Tewary method: Green's function for lattice statics, Multiscale Green's function, Causal GF in molecular dynamics |
| Scientific career | |
| Fields | Physics, Materials science, Solid-state physics, Nanomaterials |
| Institutions | National Institute of Standards and Technology |
| Doctoral advisor | (Late) Prof. F.C. Auluck, (Late) Prof. L.S. Kothari |
Vinod Tewary (born 1940) is an Indian American theoretical physicist at NIST (National Institute of Standards and Technology)[1]. Dr Tewary’s field of research is theoretical solid-state physics, with specialization in nanomaterials. He is the originator of the Tewary method for lattice statics[2], the Multiscale GF (MSGF) method [3], and the CGFMD (causal GF in molecular dynamics)[4]. These methods are used in the mathematical modeling of nanomaterials.
Additionally, Vinod Tewary is a published Hindi author.
Early life and education
Vinod Tewary was born in Hardoi, U.P., India, where he received his early education. He earned his B.Sc. and M.Sc. (Physics) degrees from the University of Lucknow (India), and his Ph.D. in Solid State Physics from the University of Delhi (India).
Career
• Research Fellow at the University of Reading, UK
• Research Fellow at the Indian Institute of Technology, Kanpur.
Main Research
1. Lattice statics GF (LSGF):[2] A technique for atomistic scale (few Angstroms) modeling of the static processes in crystals containing lattice defects. The atomistic scale modeling is needed because the conventional continuum models are not meant for simulating the physical processes in crystals near lattice defects, where the discrete atomistic effects are important. The LSGF technique is also referred to as the Tewary method. It was first referred as the Tewary method in 1973. [5][6]
2. Multiscale GF (MSGF): [3] for modeling modern nanomaterials. It is essentially a generalized version of LSGF and is valid at different length scales in crystals. It is specifically applicable to modern nanomaterials. A mathematical model for interpretation of data on nanomaterials must be multiscale because the atomistic scale effects are crucial at nanoscales, whereas the measurements are made at macroscales. The MSGF method links the atomistic scales to macroscales seamlessly.
3. Causal GF in molecular dynamics (CGFMD) for modeling time-dependent processes, that can link multiple temporal scales from femtoseconds to nanoseconds, and even microseconds[4]. It is a further extension of the MSGF method to incorporate the temporal effects. The temporal effects are needed for interpreting data in technological applications such as materials for storage batteries, thermoelectric devices, strong materials, radiation damage, etc. For example, in radiation damage in material systems used in space vehicles, the primary event consists of a high energy gamma photon hitting and displacing an atom in a solid. The secondary event consists of the displaced atom hitting and displacing other atoms, which in turn displace even more atoms in the solid. This cascade process causes a lot of damage to the material and make it unstable and unusable to carry any load. The primary event lasts for a few femtoseconds, whereas the secondary events may extend up to several microseconds. In order to understand the nature and extent of the damage and to design safe material systems, it is needed to simulate this process over multiple time scales ranging from femto to microseconds. The CGFMD technique is useful for such calculations. This research was reported in the Phys.org publication.[7]
References
- ↑ "Vinod Tewary". NIST. 9 October 2019.
- ↑ 2.0 2.1 Tewary, V.K. (November 1973). "Green-function method for lattice statics". Advances in Physics. 22 (6): 757–810. doi:10.1080/00018737300101389.
- ↑ 3.0 3.1 Tewary, V.K. (2015). "Multiscale Green's functions for modeling of nanomaterials*". Modeling, Characterization, and Production of Nanomaterials: 55–85. doi:10.1016/B978-1-78242-228-0.00002-8. ISBN 9781782422280.
- ↑ 4.0 4.1 Tewary, V. K. (22 October 2009). "Extending the time scale in molecular dynamics simulations: Propagation of ripples in graphene". Physical Review B. 80 (16): 161409. doi:10.1103/PhysRevB.80.161409.
- ↑ Ben-Abraham, S. I.; Rabinovitch, A.; Pelleg, J. (1 December 1977). "Relations between vacancy migration and formation energies, debye temperature and melting point". Physica Status Solidi B. 84 (2): 435–441. doi:10.1002/pssb.2220840205.
- ↑ Glass, N E; Boffi, S; Bilello, J C (14 July 1977). "Inelastic neutron scattering from screw dislocations". Journal of Physics C: Solid State Physics. 10 (13): 2307–2319. doi:10.1088/0022-3719/10/13/007.
- ↑ "Capturing those in-between moments: Researchers solves timing problem in molecular modeling". phys.org.
External links
This article "Vinod Tewary" is from Wikipedia. The list of its authors can be seen in its historical. Articles taken from Draft Namespace on Wikipedia could be accessed on Wikipedia's Draft Namespace. [Category:University of Lucknow alumni]]